CVE-2026-21248 Details
Description
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
A heap-based buffer overflow vulnerability has been identified in Windows Hyper-V. This vulnerability allows an authorized attacker to execute code locally. It affects multiple Windows versions, including Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022. The vulnerability arises from a buffer overflow in the Hyper-V component, which can be exploited by an attacker with access to the affected system.
Users can apply the security update provided by Microsoft to address this vulnerability. This security update is available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles KB5075904, KB5075912, KB5075999, KB5075906, KB5077181, KB5077212, and KB5075941.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21248 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 1607 | < 10.0.14393.8868 |
CPE
Remediation
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| microsoft windows 10 1809 | < 10.0.17763.8389 |
CPE
Remediation
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| microsoft windows 10 21h2 | < 10.0.19044.6937 |
CPE
Remediation
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| microsoft windows 10 22h2 | < 10.0.19045.6937 |
CPE
Remediation
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| microsoft windows 11 23h2 | < 10.0.22631.6649 |
CPE
Remediation
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| microsoft windows 11 24h2 | < 10.0.26100.7781 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.7781 |
CPE
Remediation
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| microsoft windows server 2016 | < 10.0.14393.8868 |
CPE
Remediation
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| microsoft windows server 2019 | < 10.0.17763.8389 |
CPE
Remediation
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| microsoft windows server 2022 | < 10.0.20348.4711 |
CPE
Remediation
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| microsoft windows server 2022 23h2 | < 10.0.25398.2149 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32313 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 11, 2026 | Initial Analysis | [email protected] |
| Feb 10, 2026 | New CVE Received | [email protected] |